Question

7 pounds of potatoes cost $63. How many pounds ofpotatoes can you get with $261?

Answer 1

We know that 7 pounds of potatoes cost $63.

This is a proportional relationship between quantity (pounds of potatoes) and cost.

We can calculate how many pounds of potatoes we can get with $261 applying the Rule of three:

$261\text{ \ }\cdot(\frac{7\text{ pounds}}{63\text{ \ }})=29\text{ pounds}$

We can buy 29 pounds of potatoes with $261

NOTE: I use the units ($ and pounds) to know how to multiply them in order to get the result I was looking for.